Fix for using enums as InterfaceType(s) when resynthesize from Kernel.

pkg/analyzer/test/src/summary/resynthesize_kernel_test.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.src.summary.resynthesize_kernel_test;
 
 import 'dart:async';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
@@ skipping 313 matching lines @@
   test_defaultValue_refersToGenericClass_methodG_classG() async {
     await super.test_defaultValue_refersToGenericClass_methodG_classG();
   }
 
   @failingTest
   test_defaultValue_refersToGenericClass_methodNG() async {
     await super.test_defaultValue_refersToGenericClass_methodNG();
   }
 
   @failingTest
-  test_error_extendsEnum() async {
-    await super.test_error_extendsEnum();
-  }
-
-  @failingTest
   test_executable_parameter_type_typedef() async {
     await super.test_executable_parameter_type_typedef();
   }
 
   @failingTest
   test_export_configurations_useDefault() async {
     await super.test_export_configurations_useDefault();
   }
 
   @failingTest
@@ skipping 482 matching lines @@
   @override
   Future<List<int>> readAsBytes() async {
     return file.readAsBytesSync();
   }
 
   @override
   Future<String> readAsString() async {
     return file.readAsStringSync();
   }
 }